Reenforced-concrete-floor construction



April 26, 1927.

- J. LALLY REENFORCED CONCRETE FLOOR CONSTRUCTION Filed Oct. 19, 1925 INVENTOR Patented Apr. 26, 1927.

UNITED STATES JOHN LALLY, OF GREAT NECK, .NEW YORK.

REENFORCED-CONCRETE-FLOOR CONSTRUCTION.

Application filed October 19, 1925.

My invention relates to improvements in reentoreed concrete floors tor buildings and it is my object to construct a floor, partly ot pre-cast concrete slabs and partly ot poured concrete, which will have cells or air spaces therein to lighten its Weight and to reenioree the same with metal bars so that the load carrying Capacity will not be lessened, also to have a level, solid ceiling.

ln the drawing` Fig'. l is a sectional view of the fioor construction; Fig. 2 a perspective view of the pre-east slab; and Fig. 3 a perspective View et ythe sheet metal dome.

rThe pre-east slab "a which forms the foundation ot my present invention, has a solid fiat bottom l, outwardly flaring side Walls 2, 3, el and 5, the top edges of which are provided with a channel or groove 6.

The thin sheet metal dome b has a Closed top 7 and sides 8, 9, lO and ll and is open at the bottom. It is of such size that the lower edges of the sides Will nest into the `groove 6 oit the slab a.

The tioor is Constructed by erecting a. 'form c, indicated by dot and dash lines in F ig. l, and setting thereon the precast slabs at at any desired intervals. The reentorcing bars lf2 are then laid in place. A sheet metal dome is then set into the lgroove of each slab a and the concrete (Z is limured over the Whole embedding` the sides oi the slabs (L, the deines b and the rods or bars l2 in the concrete. When the term c is removed it Will be found that the outside ot the bottoms of the pre-east slabs will form portions of the ceiling; and that the slabs are solidly locked into the poured Concrete matrix by a mortise Serial No. 63,404.

and tenen connection due to the fact that the Wide portion of the flared sides is above the ceiling level and Within the concrete matrix so that they are held in place thereby.

ln effect the metal bars and poured concrete form a system ot' girders and beams which carry and support the pre-east slabs and their associated domes.

The metal domes are easily set and hold their position during the pouring of the eoncrete, due to their edges entering the groove in the slab and form a mould for the air cell so that the resultant tioor is cellular instead ot solid and much lighter than would ordinarily be the ease.

The reentorcing rods may be of any desired shape, number and arrangement to obtain the desired strength or to meet peculiar conditions.

l. A cellular member i'or Concrete floors comprising,` a pre-east slab consistingr ot a bottom and outwardly Haring end and side Walls the top edges ot which are grooved and a sheet metal dome having' a top, sides and ends, the .edges of the sides and ends engaging the slab grooves.

2. A pre-east slab tor reenter-ced, cellular, concrete floors Consisting ot a bottom and outwardly Haring side and end Walls the top edges oit' which are greeted and adapted to engage the edges ot a sheet metal dome.

In testimony whereof I have aliixed my signature.

JOHN LALLY. 

